Electric circuit having distributed constants



Aug. 24, 1965 HlSAO MAEDA 3,202,906 ELECTRIC CIRCUIT HAVING DISTRIBUTED CONSTANTS Filed May 24. 1960 M! VEA/ 7' '9.

6 l/ISA 0 MA 50A P 3,202,906 1C Patented A g- 24, 1965 Furthermore, by applying a coating on the coil wire 3,292,995 shown in FIG. 1, of this invention with a substance ELECTRIC CIRCUIT HAVWG DIBWBUTED having a high dielectric constant, such as styrene liquid,

CGNS'KANTS Hisao Mama ghibaukoen Mmtmku, Takymm Japan 1t 15 possible to increase the distributed capacitance be- 5 tween ad acent turns of coil. Filed May 24, 196%), Ser. No. 31,313 Claims priority, appiication iapan, May 25, 1959', Sun furthering, by aPPlYmg a coatmg of femte 34/1 343 powder on the coil, it is possible also to increase the dis- 2 Claims, ({1}, 323-76) tributed inductance. In this invention, it is also possible to make the distributed capacitance variable by varying This invention relates to a new and improved, dis- 10 the area of the grounded electrodes. Furthermore, in this tributed constant circuit. invention, it is also possible to wind the coil in bifilar It is an object of the invention to provide a distributed winding of two windings, or a greater number of windconstant circuit of small physical dimensions. ings. Also in this invention, it is possible to grind the It is another object of the invention to provide a ceramic bobbin to have a uniform thickness or to have distributed constant circuit as mentioned above wherein, a tapered thickness so as to vary the distributed capacithrough the use of a relatively simple construction, the tance progressively. magneic flux of the input signal is effectively prevented It is also possible in this invention to use inductances from influencing the output portion of the coil. or capacitances of concentrated constants depending on It is yet another object of the invention to provide a the necessity. distributed constant circuit as described above and having Although this invention has been described, for the a construction which permits simple adjustments and most part, with respect to a particular embodiment therechanges, whereby various characteristics of the distributed of, it is not to be so limited as changes and modificaconstant circuit may be readily varied to suit its intended tions may be made therein which are within the full use. intended scope of the invention, as defined by the ap- The manner in which the foregoing as well as other pended claims. objects and advantages may best be achieved will be I claim: understood more fully from a consideration of the 1. An electric circuit having distributed constants which following description of one representative embodiment comprises, in combination, a hollow tube of insulatof the invention, taken in conjunction with the accoming material; an uninsulated coil wound on said tube panying drawing in which: in longitudinal direction substantially across the entire FIG. 1 is a perspective view showing the coil used in length of said tube; evenly spaced capacitive ground one embodiment of this invention; electrode strips fixed to the inner surface of said tube, FIG. 2 is a perspective view showing the ceramic parallel to each other and traversing the entire length bobbin of the coil with ground electrodes, of the em of said tube; a plurality of ferrite rings coaxially fitting bodiment of FIG. 1; the outer surface of said coil in parallel to each other FIG. 3 is a perspective view showing a group of ferrite and at suitably spaced intervals, said rings having a rings to be fitted on the outer surface of the coil of FIG. width to obtain a predetermined inductance for the 1 according to the invention; portion of the coil thus covered, the magnetic flux of FIG. 4 i a perspective view howing a conv nti n l said coil thus being focused according to the number of ferrite core of integral bar form, which is inserted in ferrite rings and minimizing the influence 0f the input th b bbi of FIG 2; side of said coil on its output side; and a ferrite core FIG. 5 is an electrical connection diagram showing a inserted n t e interior of said tube. circuit which is electrically equivalent to the embodiment n electric circuit hav ng distributed constants of the invention which comprises, in combination, a hollow tube of in- Referring to the drawing one of the members of the sulating material; an uninsulated coil wound on said embodiment is a ceramic bobbin C of a mammal having tube in longitudinal direction substantially across the a high dielectric constant, such as titanium oxide. entire lfingth of i tube; evenly spaced capacitive A conductor line L in coil form is wound about said ground electrode strips fixed to the inner surface of ceramic bobbin C which is provided on its inner surface y said tube, parallel to each other and traversing the entire with ground electrodes E. The ferrite rings F to be DO lensth of Said tube; a plurality of g f Tings coaxiauy used in the embodiment have diameters which enable fittmg the outer, surface of f 6011 R l to a said rings to be fitted coaxially at certain spaced intervals other and at Sultably Spaced mien/211$, Bald rings having over the: outer Surface of the coil of Hg when the a width to obtain a predetermined inductance for said said coil is assembled in the above manner, the magnetic cell thus f the magnet: flux of F 9 bicmg flux of the coil is focused according to the number of focusefl F FQ f the number P ferrite rings Accordingly, the magnetic flux of the and rninnnizing the influence of the input side of sald coil input side of the coil has only a slight influence on the on lts Output slde; and a femte Powder coating apphed output Side of the coil to the outer surface of said coil.

The electrically equivalent circuit of the embodiment 69 R it re ces Ct d b theE aminer is shown in FIG. 5. e e n l e y x If the ferrite core F shown in FIG. 4 is inserted in the UNITED STATES PATENTS interior of the coil bobbin of this invention, the local 2,296,452 9/42 Rust 336-198 focusing of the magnetic flux is further improved. The 2,594,915 4/52 Guillemant 336-83 X term grounded electrodes of this invention does not 2,654,861 10/53 Khouri 323-76 necessarily mean that these must be grounded as a matter FOREIGN PATENTS or course. By suitably covering the surface of the C011 wire, shown in FIG. 1, of this invention with a substance 649,398 1/51 Great Bntamhaving a high dielectric constant, such as styrene liquid, 70 I it is possible to increase the distributed capacitance be- LLOYD MCCOLLUM Prlmary Examme' tween adjacent turns of coil. MILTON O. HIRSHFIELD, Examiner. 

1. AN ELECTRICC CIRCUIT HAVING DISTRIBUTED CONSTANTS WHICH COMPRISES, IN COMBINATION, A HOLLOW TUBE OF INSULATING MATERIAL; AN UNINSULATED COIL WOUND ON SAID TUBE IN LONNGITUDINAL DIRECTION SUBSTANTIALLY ACROSS THE ENTIRE LENGTH OF SAID TUBE; EVENLY SPACED CAPACITIVE GROUND, ELECTRODE STRIPS FIXED TO THE INNER SURFACE OF SAID TUBE, PARALLEL TO EACH OTHER ANNND TRANSVERSING THE ENNNTIRE LENGTH OF SAID TUBE; A PLURALITY OF FERITE RINGS COAXIALLY FITTTSING THE OUTE SURFACE OF SAID COIL IN PARALLEL TO EACH OTHER AND AT SUITABLY SPACED INTERVALS, SAID RINGS HAVING A WIDTH TO OBTAIN A PREDETERMIJED INDUCTIANCE FOR THE PORTIONN OF THE COIL THUS COVERED, THE MAGNETIC FLUX OF SAID COIL THUS BEING FOCUSED ACCORDING TO THE NUMBER OF FERRTIE RINGS AND MINIMIZING THE INFLUEENCE OF THE INPUT SIDE OF SAID COIL ON ITS OUTPUT SIDE; AND A FERITE CORE INSERTED IN THE INTERRIOR OF SAID TUBE. 